Search a number
-
+
2831 = 19149
BaseRepresentation
bin101100001111
310212212
4230033
542311
621035
711153
oct5417
93785
102831
112144
12177b
13139a
141063
15c8b
hexb0f

2831 has 4 divisors (see below), whose sum is σ = 3000. Its totient is φ = 2664.

The previous prime is 2819. The next prime is 2833. The reversal of 2831 is 1382.

It can be divided in two parts, 28 and 31, that multiplied together give a palindrome (868).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1382 = 2691.

It is a cyclic number.

It is not a de Polignac number, because 2831 - 26 = 2767 is a prime.

It is a super-2 number, since 2×28312 = 16029122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 12 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 93.

It is an arithmetic number, because the mean of its divisors is an integer number (750).

2831 is a deficient number, since it is larger than the sum of its proper divisors (169).

2831 is a wasteful number, since it uses less digits than its factorization.

2831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168.

The product of its digits is 48, while the sum is 14.

The square root of 2831 is about 53.2071423777. The cubic root of 2831 is about 14.1464224496.

The spelling of 2831 in words is "two thousand, eight hundred thirty-one".

Divisors: 1 19 149 2831